Display device and method of driving the same
A display device includes a display panel including a pixel coupled to a data line, a read-out line, a scan line, and a sensing line, a scan driver for generating scan and sensing signals to be supplied to the scan and sensing lines, a voltage controller for controlling a gate-on voltage of each of the scan and sensing signals to be supplied to the pixel during a mobility sensing period, a data driver for supplying a data signal to the data line, and a compensator for sensing current flowing from the pixel to the read-out line and compensate for the data signal, wherein the mobility sensing period includes a period during which each of the scan and sensing signals has a first voltage, a period during which the gate-on voltage of the scan and sensing signals changes, and a period during which the sensing signal has the first voltage.
1. A display device comprising:
a display panel comprising a pixel coupled to a data line, a read-out line, a scan line, and a sensing line;
a scan driver configured to generate a scan signal and a sensing signal to be respectively supplied to the scan line and the sensing line;
a voltage controller configured to control a gate-on voltage of each of the scan signal and the sensing signal to be supplied to the pixel during a mobility sensing period;
a data driver configured to supply a data signal to the data line; and
a compensator configured to sense current flowing from the pixel to the read-out line and compensate for the data signal,
wherein the mobility sensing period comprises a first period during which each of the scan signal and the sensing signal has a first voltage, a second period during which the gate-on voltage of each of the scan signal and the sensing signal changes, and a third period during which the sensing signal has the first voltage again.
2. The display device according to claim 1 , wherein, during the second period, each of the scan signal and the sensing signal is reduced to a second voltage.
3. The display device according to claim 2 , wherein, during the third period, the scan signal has a third voltage lower than the second voltage.
4. The display device according to claim 3 , wherein each of the first voltage and the second voltage is the gate-on voltage, and the third voltage is a gate-off voltage.
5. The display device according to claim 3 , wherein a falling time at which the scan signal changes from the second voltage to the third voltage synchronizes with a rising time at which the sensing signal changes from the second voltage to the first voltage.
6. The display device according to claim 2 , wherein the voltage controller comprises:
a multiplexer configured to output, in response to a first voltage control signal and a second voltage control signal, one of the first voltage and a kickback slice voltage that changes from the first voltage to the second voltage.
7. The display device according to claim 6 , wherein, during the second period, each of the scan signal and the sensing signal is reduced from the first voltage to the second voltage at a set rate.
8. The display device according to claim 1 , wherein, during the mobility sensing period, a period during which the sensing signal has the first voltage is longer than a period during which the scan signal has the first voltage.
9. The display device according to claim 1 , wherein the mobility sensing period comprises a plurality of first to third periods for each pixel row.
10. The display device according to claim 1 , wherein the pixel comprises:
an organic light-emitting diode;
a first transistor coupled between a first driving power supply and an anode electrode of the organic light-emitting diode, and comprising a gate electrode coupled to a first node;
a second transistor coupled between the data line and the first node, and comprising a gate electrode configured to receive the scan signal;
a third transistor coupled between the read-out line and the anode electrode of the organic light-emitting diode, and comprising a gate electrode configured to receive the sensing signal; and
a storage capacitor coupled between the first node and the anode electrode of the organic light-emitting diode.
11. A method of driving a display device, the method comprising:
during a first period of a frame, supplying, from a scan driver, a scan signal having a first voltage to a k-th scan line (k being a natural number) and supplying, from the scan driver, a sensing signal having the first voltage to a k-th sensing line;
during a second period of the frame, changing each of the scan signal and the sensing signal from the first voltage to a second voltage; and
during a third period of the frame, supplying the sensing signal having a voltage higher than the second voltage.
12. The method according to claim 11 , wherein the first voltage is higher than the second voltage.
13. The method according to claim 12 , wherein, during the third period, the scan signal has a third voltage lower than the second voltage.
14. The method according to claim 13 , wherein each of the first voltage and the second voltage is a gate-on voltage, and the third voltage is a gate-off voltage.
15. The method according to claim 13 , wherein a falling time at which the scan signal changes from the second voltage to the third voltage synchronizes with a rising time at which the sensing signal changes from the second voltage to the first voltage.
16. The method according to claim 12 , wherein, during the second period, each of the scan signal and the sensing signal is reduced from the first voltage to the second voltage at a set rate.
17. The method according to claim 11 , wherein the first to third periods are during a mobility sensing period of a driving transistor of each of pixels in a k-th pixel row.
18. The method according to claim 17 , wherein the first to third periods are sequentially applied on a pixel row basis.
19. The method according to claim 17 , wherein the first to third periods are during a blank period of a frame and are selectively applied to some pixel rows.